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hartnnBest ResponseYou've already chosen the best response.1
split cos^3 x = cos x * cos^2 x write cos^2 x = 1 sin^2 x then its easy to see that u = sin x du =cos x dx.
 one year ago

sat_chenBest ResponseYou've already chosen the best response.1
so do you leave sin^5x as it is
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
yes, then you'll use it... s^5 (1s^2) c dx [s=sin, c=cos]
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
s^5 (1s^2) c dx = (s^5 s^7) cdx
 one year ago

sat_chenBest ResponseYou've already chosen the best response.1
ah i see how that tricked me i tried to think it was a half angle formula or something
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
so, now can you solve that integral ?
 one year ago

sat_chenBest ResponseYou've already chosen the best response.1
yea i can thanks a lot bro
 one year ago

sat_chenBest ResponseYou've already chosen the best response.1
math not my best subject :P
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
it became my best subject, after lot of practicing :)
 one year ago

sat_chenBest ResponseYou've already chosen the best response.1
1 question though can you split sin of x to solve also
 one year ago

hartnnBest ResponseYou've already chosen the best response.1
yes,but that will be more complicated....but yes.
 one year ago

sat_chenBest ResponseYou've already chosen the best response.1
if i need help again asking you :P
 one year ago
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